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/*
* ths7303- THS7303 Video Amplifier driver
*
* Copyright (C) 2009 Texas Instruments Incorporated - http://www.ti.com/
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation version 2.
*
* This program is distributed .as is. WITHOUT ANY WARRANTY of any
* kind, whether express or implied; without even the implied warranty
* of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*/
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/ctype.h>
#include <linux/slab.h>
#include <linux/i2c.h>
#include <linux/device.h>
#include <linux/delay.h>
#include <linux/module.h>
#include <linux/uaccess.h>
#include <linux/videodev2.h>
#include <media/v4l2-device.h>
#include <media/v4l2-subdev.h>
#include <media/v4l2-chip-ident.h>
#define THS7303_CHANNEL_1 1
#define THS7303_CHANNEL_2 2
#define THS7303_CHANNEL_3 3
enum ths7303_filter_mode {
THS7303_FILTER_MODE_480I_576I,
THS7303_FILTER_MODE_480P_576P,
THS7303_FILTER_MODE_720P_1080I,
THS7303_FILTER_MODE_1080P,
THS7303_FILTER_MODE_DISABLE
};
MODULE_DESCRIPTION("TI THS7303 video amplifier driver");
MODULE_AUTHOR("Chaithrika U S");
MODULE_LICENSE("GPL");
static int debug;
module_param(debug, int, 0644);
MODULE_PARM_DESC(debug, "Debug level 0-1");
/* following function is used to set ths7303 */
int ths7303_setval(struct v4l2_subdev *sd, enum ths7303_filter_mode mode)
{
u8 input_bias_chroma = 3;
u8 input_bias_luma = 3;
int disable = 0;
int err = 0;
u8 val = 0;
u8 temp;
struct i2c_client *client = v4l2_get_subdevdata(sd);
if (!client)
return -EINVAL;
switch (mode) {
case THS7303_FILTER_MODE_1080P:
val = (3 << 6);
val |= (3 << 3);
break;
case THS7303_FILTER_MODE_720P_1080I:
val = (2 << 6);
val |= (2 << 3);
break;
case THS7303_FILTER_MODE_480P_576P:
val = (1 << 6);
val |= (1 << 3);
break;
case THS7303_FILTER_MODE_480I_576I:
break;
case THS7303_FILTER_MODE_DISABLE:
pr_info("mode disabled\n");
/* disable all channels */
disable = 1;
default:
/* disable all channels */
disable = 1;
}
/* Setup channel 2 - Luma - Green */
temp = val;
if (!disable)
val |= input_bias_luma;
err = i2c_smbus_write_byte_data(client, THS7303_CHANNEL_2, val);
if (err)
goto out;
/* setup two chroma channels */
if (!disable)
temp |= input_bias_chroma;
err = i2c_smbus_write_byte_data(client, THS7303_CHANNEL_1, temp);
if (err)
goto out;
err = i2c_smbus_write_byte_data(client, THS7303_CHANNEL_3, temp);
if (err)
goto out;
return err;
out:
pr_info("write byte data failed\n");
return err;
}
static int ths7303_s_std_output(struct v4l2_subdev *sd, v4l2_std_id norm)
{
if (norm & (V4L2_STD_ALL & ~V4L2_STD_SECAM))
return ths7303_setval(sd, THS7303_FILTER_MODE_480I_576I);
else
return ths7303_setval(sd, THS7303_FILTER_MODE_DISABLE);
}
/* for setting filter for HD output */
static int ths7303_s_dv_timings(struct v4l2_subdev *sd,
struct v4l2_dv_timings *dv_timings)
{
u32 height = dv_timings->bt.height;
int interlaced = dv_timings->bt.interlaced;
int res = 0;
if (height == 1080 && !interlaced)
res = ths7303_setval(sd, THS7303_FILTER_MODE_1080P);
else if ((height == 720 && !interlaced) ||
(height == 1080 && interlaced))
res = ths7303_setval(sd, THS7303_FILTER_MODE_720P_1080I);
else if ((height == 480 || height == 576) && !interlaced)
res = ths7303_setval(sd, THS7303_FILTER_MODE_480P_576P);
else
/* disable all channels */
res = ths7303_setval(sd, THS7303_FILTER_MODE_DISABLE);
return res;
}
static int ths7303_g_chip_ident(struct v4l2_subdev *sd,
struct v4l2_dbg_chip_ident *chip)
{
struct i2c_client *client = v4l2_get_subdevdata(sd);
return v4l2_chip_ident_i2c_client(client, chip, V4L2_IDENT_THS7303, 0);
}
static const struct v4l2_subdev_video_ops ths7303_video_ops = {
.s_std_output = ths7303_s_std_output,
.s_dv_timings = ths7303_s_dv_timings,
};
static const struct v4l2_subdev_core_ops ths7303_core_ops = {
.g_chip_ident = ths7303_g_chip_ident,
};
static const struct v4l2_subdev_ops ths7303_ops = {
.core = &ths7303_core_ops,
.video = &ths7303_video_ops,
};
static int ths7303_probe(struct i2c_client *client,
const struct i2c_device_id *id)
{
struct v4l2_subdev *sd;
v4l2_std_id std_id = V4L2_STD_NTSC;
if (!i2c_check_functionality(client->adapter, I2C_FUNC_SMBUS_BYTE_DATA))
return -ENODEV;
v4l_info(client, "chip found @ 0x%x (%s)\n",
client->addr << 1, client->adapter->name);
sd = kzalloc(sizeof(struct v4l2_subdev), GFP_KERNEL);
if (sd == NULL)
return -ENOMEM;
v4l2_i2c_subdev_init(sd, client, &ths7303_ops);
return ths7303_s_std_output(sd, std_id);
}
static int ths7303_remove(struct i2c_client *client)
{
struct v4l2_subdev *sd = i2c_get_clientdata(client);
v4l2_device_unregister_subdev(sd);
kfree(sd);
return 0;
}
static const struct i2c_device_id ths7303_id[] = {
{"ths7303", 0},
{},
};
MODULE_DEVICE_TABLE(i2c, ths7303_id);
static struct i2c_driver ths7303_driver = {
.driver = {
.owner = THIS_MODULE,
.name = "ths7303",
},
.probe = ths7303_probe,
.remove = ths7303_remove,
.id_table = ths7303_id,
};
module_i2c_driver(ths7303_driver);
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